Other
Scientific paper
Jul 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984iue..prop.1860n&link_type=abstract
IUE Proposal ID #SPGRN
Other
Scientific paper
We propose a series of ultraviolet spectral observations of solid surfaces of selected solar system objects, specifically the Galilean satellites of Jupiter, several atmosphereless satellites of Saturn, and selected asteroids. Such spectral observations of planetary satellites have allowed for the identification of spectrally active solid state materials on planetary satellite surfaces. Furthermore, because the rotational properties are known for all the satellites proposed for study, this technique has allowed us to begin production of a longitude map of such materials on the objects' surfaces. The asteroid spectra we have previously acquired with IUE have created unique subdivisions within the existent asteroid types. Because Io is the most volcanically active body in the solar system, and short term variations in selected regions of the Jovian magnetosphere are known to occur, it is important to take spectra regularly at large, solar phase angles to check for temporal variations in the spectra. We propose an additional set of Galilean satellite observations at low solar phase angle in order to study the opposition brightness surge of these objects in the UV. The magnitude of this surge combined with the UV albedo at large solar phase angle provide additional information regarding the surface texture of the satellites. These proposed UV observations are critical to the sequence design of several instruments on Project Galileo, NASA's Jupiter Orbiter and Probe Mission. Spectra of Iapetus, Rhea and Dione have been acquired during the previous two years; however, only at orbital locations near elongation. The dark leading face of Iapetus has not been well characterized because the time period where optimum detection of the dark material occurs only lasts about one-half day and past scheduling has not permitted data acquisition in this time-window. We wish to carefully arrange the observations to permit this critical measurement, as well as acquiring a few other orbital phase angles for Dione and Rhea. The Voyager spacecraft made a few broad-band measurements at 260 nm but IUE data are needed to fix the low solar phase angle data.
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